A person who has excessive back fat to the point where it looks as if they are conceling a back pack in their shirt.
"wow I thought that lady had a back pack on but she is just a back pack back".
by the one they call wonka March 03, 2009
1 more definition
When students carry a backpack on their back too long.
Arghhhh, I'm getting a backpack back from these textbooks.
by Billie Yuan May 26, 2005